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furnace red tagged no rating plate

Hello everyone. My name is Kirk and Im new on here so I hope you can help me.I have a Keeprite gas furnace installed in Jan 91.Its a 69,000 btu model with standing pilot light....The rating plate is missing and the gas utility has shut it down.Does anyone know if there is a serial or model number anywhere else on the unit? It needs a cleaning but other than that its fine (no CO. or gas leaks and burners are working fine)...........so unless I can ID. this unit I have no heat......thanks Kirk

The guy is making excuses..he said there was rust but its not, its male cat urine thats dried on the ductwork between the joists and duct.Its water soluable and can be also be scraped or sanded off.Its galvanized to begin with...............It does need a good cleaning and even if I get someone out they have locked the meter thanks

what if I turn it on ,they wont find out untill the spring and by then I can probably get the situation corrected somehow...thanks

If they tagged it, I wouldn't recommend you turning it back on until you have a qualified professional check it out and have the utility company explained why they shut it down to begin with. In my area when they tag something and it states "maintenance required," usually the burners are so dirty that there are combustion/drafting issues that can be hazardous.